3646121 has 4 divisors (see below), whose sum is σ = 3804672. Its totient is φ = 3487572.

The previous prime is 3646117. The next prime is 3646129. The reversal of 3646121 is 1216463.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1216463 = 29 ⋅41947.

It is a cyclic number.

It is not a de Polignac number, because 3646121 - 2² = 3646117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 158527 = 3646121 / (3 + 6 + 4 + 6 + 1 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3646129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79241 + ... + 79286.

It is an arithmetic number, because the mean of its divisors is an integer number (951168).

Almost surely, 2^3646121 is an apocalyptic number.

It is an amenable number.

3646121 is a deficient number, since it is larger than the sum of its proper divisors (158551).

3646121 is a wasteful number, since it uses less digits than its factorization.

3646121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158550.

The product of its digits is 864, while the sum is 23.

The square root of 3646121 is about 1909.4818668948. The cubic root of 3646121 is about 153.9136103989.

The spelling of 3646121 in words is "three million, six hundred forty-six thousand, one hundred twenty-one".